Occurrences of a specified character

The problem

Write a method that finds the number of occurrences of a specified character in a string using the following header: public static int count(String str, char a) For example, count("Welcome", 'e') returns 2. Write a test program that prompts the user to enter a string followed by a character and displays the number of occurrences of the character in the string.

Breaking it down

public static void main(String[] args) {

    Scanner input = new Scanner(System.in);
    System.out.print("Enter a string: ");
    String sentence = input.nextLine();
    System.out.print("Enter a character: ");
    String ch = input.next();


    Map<String, Long> frequentChars = Arrays.stream(
            Collectors.groupingBy(c -> c, Collectors.counting()));

    System.out.println("The number of occurrences of 
" + ch + " in \"" + sentence + "\" is " + frequentChars.get(ch)); }


Enter a string: welcome
Enter a character: e
The number of occurrences of 'e' in "welcome" is 2